土体介质直剪力学特性颗粒尺度效应的理论与试验研究

doi:10.13722/j.cnki.jrme.2014.0742

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Abstract Soil is a complex granular medium and its strength and deformation characteristics behave strong particle size effect. On the basis of the physical effects of cohesion and friction generated by the interactions between soil particles at different scales，a soil cell element that can describe the internal material information and particle characteristics of soil was constructed by dividing particle size into different scales to investigate the influence of soil particles at different scales on the macro-scale mechanical properties of soil. According to the mechanical responses of soil at various scales，the notion of coordinated micro-cracks was introduced，and a multi-scale and hierarchical soil cell element model was proposed to establish the conversion relationship of the displacement and stress between different scales. Therefore，the microscopic soil mechanics was promoted from qualitative analysis to quantitative calculation. Moreover，various soil samples with a variety particle combinations were prepared for a series of direct shear tests to study the particle size effect of soil. Meanwhile，microscopic parameters of the model such as the strain gradient and intrinsic length scale were quantitatively studied. The results show that：The yield stress of soil increases with an increase in the volume fraction of the reinforcement particles. When the volume fraction of the reinforcement particles is low(≤0.125)，the yield stress of soil increases with a decrease in the reinforcement particle size whereas when the volume fraction of these particles is high(≥0.177)，the yield stress of soil increases with an increase in the reinforcement particle size. The action of the reinforcement particles that causes the strain gradient and coordinated micro-cracks of soil to appear at the matrix joined with the reinforcement particles is the microscopic physical mechanism of the particle size effect of soil. The yield stress of soil calculated by the soil cell element model is in good agreement with that of the test result.

Key words： soil mechanics particle size effect soil cell element model multi-scale framework physical mechanism

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	FENG Deluan1
	FANG Yingguang1
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FENG Deluan1,FANG Yingguang1,2. THEORETICAL AND EXPERIMENTAL RESEARCH ON PARTICLE SIZE EFFECT OF DIRECT SHEAR MECHANICAL PROPERTIES OF SOIL[J]. , 2015, 34(S2): 4307-4319.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0742 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/4307

[1] 刘斯宏，徐永福. 粒状体直剪试验的数值模拟与微观考察[J]. 岩石力学与工程学报，2001，20(3)：288–292.(LIU Sihong，XU Yongfu. Numerical simulation for a direct box shear test on granular material and microscopic consideration[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(3)：288–292.(in Chinese))

[2] DE GENNES P G. Granular matter：a tentative view[J]. Reviews of Modern Physics，1999，71(2)：S374.

[3] BA?ANT Z P. Size effect on structural strength：a review[J]. Archive of Applied Mechanics，1999，69(9/10)：703–725.

[4] CAMPBELL C S. Granular material flows-an overview[J]. Powder Technology，2006，162(3)：208–229.

[5] YIMSIRI S，SOGA K. Effects of soil fabric on behaviors of granular soils：microscopic modeling[J]. Computers and Geotechnics，2011，38(7)：861–874.

[6] 房营光. 土体强度与变形尺度特性的理论与试验分析[J]. 岩土力学，2014，35(1)：41–47.(FANG Yingguang. Theoretical and experimental investigation on size effect characteristic of strength and deformation of soil[J]. Rock and Soil Mechanics，2014，35(1)：41–47.(in Chinese))

[7] 刘清秉，项伟，崔德山，等. 颗粒形状对砂土抗剪强度及桩端阻力影响机制试验研究[J]. 岩石力学与工程学报，2011，30(2)：400–409.(LIU Qingbing，XIANG Wei，CUI Deshan，et al. Experimental study of effect of particle shapes on shear strength of sand and tip resistance of driven piles[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(2)：400–409.(in Chinese))

[8] 徐文杰，胡瑞林，岳中琦，等. 基于数字图像分析及大型直剪试验的土石混合体块石含量与抗剪强度关系研究[J]. 岩石力学与工程学报，2008，27(5)：996–1 007.(XU Wenjie，HU Ruilin，YUE Zhongqi，et al. Research on relationship between rock block proportion and shear strength of soil-rock mixtures based on digital image analysis and large direct shear test[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(5)：996–1 007.(in Chinese))

[9] 房营光. 颗粒介质尺度效应的抗剪试验及物理机制分析[J]. 物理学报，2014，63(3)：034502.(FANG Yingguang. Shear test and physical mechanism analysis on size effect of granular media[J]. Acta Physica Sinica，2014，63(3)：034502.(in Chinese))

[10] JUNG Y H，CHUNG C K. Role of micromechanics features on stress-level dependency of cross-anisotropic elastic moduli in granular soils[J]. Computers and Geotechnics，2008，35(2)：265–277.

[11] ANDRADE J E，AVILA C F，HALL S A，et al. Multiscale modeling and characterization of granular matter：from grain kinematics to continuum mechanics[J]. Journal of the Mechanics and Physics of Solids，2011，59(2)：237–250.

[12] AVILA C，ANDRADE J. Advances in multiscale modeling and characterization of granular matter[J]. Procedia IUTAM，2012，3：157–171.

[13] FLECK N A，HUTCHINSON J W. Strain gradient plasticity[J]. Advances in Applied Mechanics，1997，33：295–361.

[14] GAO H，HUANG Y，NIX W D，et al. Mechanism-based strain gradient plasticity-I. Theory[J]. Journal of the Mechanics and Physics of Solids，1999，47(6)：1 239–1 263

[15] Abu Al-Rub R K，VOYIADJIS G Z. A physically based gradient plasticity theory[J]. International Journal of Plasticity，2006，22(4)：654–684.

[16] ZHAO J，SHENG D，ZHOU W. Shear banding analysis of geomaterials by strain gradient enhanced damage model[J]. International Journal of Solids and Structures，2005，42(20)：5 335–5 355.

[17] IVERSON R M. The physics of debris flows[J]. Reviews of Geophysics，1997，35(3)：245–296.

[18] CUNDALL P A，STRACK O D L. A discrete numerical model for granular assembles[J]. Geotechnique，1979，29(1)：47–65.

[19] 房营光，冯德銮，马文旭，等. 土体介质强度尺度效应的理论与试验研究[J]. 岩石力学与工程学报，2013，32(11)：2 359–2 367. (FANG Yingguang，FENG Deluan，MA Wenxu，et al. Theoretical and experimental study on size effect of soil strength[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(11)：2 359–2 367.(in Chinese))

[20] MITCHELL J K，KENICHI S. Fundamentals of soil behavior[M]. New York：John Wiley and Sons，Inc.，2005：35–38.

[21] SUN Q C，WANG G Q，HU K H. Some open problems in granular matter mechanics[J]. Progress in Natural Science，2009，19(5)：523–529.

[22] LAWN B. Fracture of brittle solids[M]. London：Cambridge University Press，1993：14–18.

[23] 中华人民共和国行业标准编写组. GB/T50123—1999土工试验方法标准[S]. 北京：中国建筑工业出版社，2000.(The Professional Standards Compilation Group of People¢s Republic of China. GB/T50123—1999 Specification of soil test[S]. Beijing：China Architecture and Building Press，2000.(in Chinese))

[24] ABU AL-RUB R K，VOYIADJIS G Z. Analytical and experimental determination of the material intrinsic length scale of strain gradient plasticity theory from micro-and nano-indentation experiments[J]. International Journal of Plasticity，2004，20(6)：1 139–1 182.

[25] ARSLAN H，STURE S. Evaluation of a physical length scale for granular materials[J]. Computational Materials Science，2008，42(3)：525–530.

[26] VOYIADJIS G Z，ALSALEH M I，ALSHIBLI K A. Evolving internal length scales in plastic strain localization for granular materials[J]. International Journal of Plasticity，2005，21(10)：2 000–2 024.